Space/speɪs/ Definition 1 of 5Pro Tip 1/3Concrete vs Abstract Space refers to a physical empty area or to an abstract concept like freedom. He values his personal space as much as physical space. Pro Tip 2/3Not Always Visible Space can refer to an area that can't be seen but can be filled or used. Hang the picture to fill the space on the wall. Pro Tip 3/3Capacity Used to refer to the capacity or volume within a three-dimensional area. The garage has space for two cars.